I don't but I know its a pain in the @$$ to get through the first line of communication with the owners.
If you wanted to buy a website from a SEDO user, YOU would have to sign an affidavit contract saying that you agree not to scam anyone on any of their parked sites. What's worse it that they have the WORST cookie system in place. Its hard to even login to their site, so I would recommend a better marketplace, if I were you.